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Finding the Fourth Proportional to 28,091.70, 42,009.59 and 20,980.94

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Solution

The fourth proportional to 28,091.70, 42,009.59 and 20,980.94 is: 31,375.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,091.70 : 42,009.59 = 20,980.94 : x
  2. Step 2: Convert to fraction form
    28,091.70/42,009.59 = 20,980.94/x
  3. Step 3: Cross multiply
    28,091.70x = 42,009.59 × 20,980.94
  4. Step 4: Simplify right side
    28,091.70x = 881,400,372.26
  5. Step 5: Solve for x
    x = 881,400,372.26/28,091.70
  6. Step 6: Final answer
    x = 31,375.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.